# All That You Need to Know about a Diamond’s Carat Weight

By Charlie Brown, 26th Aug 2017 | Follow this author | RSS Feed
Posted in Wikinut>Guides>Fashion>Shoes & Boots

A carat (often abbreviated CT) is the standard measure used for weighing diamonds. Many people confuse the weight with a stone’s physical size. Perhaps you are one of them. However, you are not way off the mark since the weight differs depending on the type and shape of the gemstone.

## All That You Need to Know about a Diamond’s Carat Weight

A carat (often abbreviated CT) is the standard measure used for weighing diamonds. Many people confuse the weight with a stone’s physical size. Perhaps you are one of them. However, you are not way off the mark since the weight differs depending on the type and shape of the gemstone.

Weight difference

A round-shaped diamond weighing 1.00 ct. measures about 6.5 mm. On the other hand, a sapphire with the same weight is about 6.0 mm. The difference is as a result of varying densities of the stones. You may have a jewelry item having several gemstones in it. The overall weight of the object becomes the total carat weight (abbreviated T.C.W.)

Exponential prices

As the carat weight rises, the price of diamond increases. You should note that this increase is exponential and not linear. An example will help you understand better. A diamond weighing 1.00 ct. has a higher value than two pieces each with a 0.50 ct. For this comparison to hold, the two items must have the same quality.

Cut-off weight

Diamonds that are double the weight of their smaller counterparts can fetch four times more. You might wonder why these discrepancies exist. The explanation is simply that large diamonds are rare. There are other categories of these gemstones. In the industry jargon, they call them undersize. They weigh slightly lower than the preferred cut-off weight.

While 1 carat is the typical ideal weight,the following are the cut-off weights:
• 0.50 ct.
• 0.75 ct.
• 0.90 ct.
• 1.00 ct.
• 1.50 ct.
• 2.00 ct.

You will hardly find these weights at a jeweler’s shop. There is a good reason why. Diamond cutters often choose to achieve a cut-off threshold at the expense of a stone’s beauty. The other term for these measures is magic numbers.

Antique jewelry exceptions

If you opt to go for antique jewelry, the weight restrictions may not apply. Jewelers prefer to sell such stones without any alterations. Under such circumstances, you cannot determine the diamond’s exact weight. However, an antique jeweler can estimate the size as well as the weight. Among the factors that affect the weight of a gemstone are:

• Overall depth
• Crown height
• Thickness of the girdle

Having looked at the different aspects that contribute to a diamond’s weight, here are two valuable tips on buying them online:

• Learn the language used – An ideal starting place would be the 4Cs (color, carat, clarity, cut). After that, find buying guides online to help you understand how the industry works.
• Only go for the certified stones – Buy diamonds that come with a certificate from a gemological institute. The document shows all qualities of the piece procured. Make sure you get a certificate for any purchase.

Besides being conversant with diamond language and obtaining a credential, always buy from registered manufacturers or dealers. Research the seller online. Send them an email or call the firm and request for industry regulation details. Surely, they must belong to one association or the other.

### Meet the author

Charlie Brown
Charlie is a content writer